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Simplifying 20 + 8r = -4 + 4r Solving 20 + 8r = -4 + 4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4r' to each side of the equation. 20 + 8r + -4r = -4 + 4r + -4r Combine like terms: 8r + -4r = 4r 20 + 4r = -4 + 4r + -4r Combine like terms: 4r + -4r = 0 20 + 4r = -4 + 0 20 + 4r = -4 Add '-20' to each side of the equation. 20 + -20 + 4r = -4 + -20 Combine like terms: 20 + -20 = 0 0 + 4r = -4 + -20 4r = -4 + -20 Combine like terms: -4 + -20 = -24 4r = -24 Divide each side by '4'. r = -6 Simplifying r = -6
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